I've been a fan of the Vertical Mouse for a while now, since the extreme
wrist pronation of a conventional horizontal mouse aggravates my wrist.
Unfortunately, however, Evoluent saw fit to put a blindingly bright blue
lit-up logo on the back of the latest version (much to the delight of
absolutely nobody in their target market). This is particularly
problematic if you work late or sleep in the same room as your computer
(blue light messes with your sleep cycle, hence tools like
Redshift).

After unplugging my mouse every night for so long, I finally decided to
tear the thing apart and see how easy it would be to disable those
lights. It turns out this is very easy, you don't even need to desolder
anything. There are four screw holes hidden under the label and front
pad on the bottom. You don't need to remove the other two pads like I
did in the process of figuring this out.

Remove all four screws and the top should come off easily. There are
ribbon cables connecting the buttons, though, so don't pull too hard.
Now you can see the battery of LEDS.

Luckily, this pointless board is connected with a header, so you can
simply unplug it, and reassemble the mouse.